Overhead silane self-crosslinking bi-component internal shielding material and preparation method thereof

Abstract

The invention belongs to the technical field of aerial cables, and particularly relates to an aerial silane self-crosslinking bi-component internal shielding material and a preparation method thereof. The component material A comprises the following components in parts by weight: 35-48 parts of an ethylene-vinyl alcohol copolymer, 26-28 parts of an ethylene-vinyl acetate copolymer, 15-20 parts of conductive carbon black, 8-10 parts of an inorganic filler, 1-2 parts of a silane coupling agent, 0.5-2 parts of an antioxidant, 0.5-1 part of a flame retardant, 0.5-1 part of an initiator and 0.5-1 part of a lubricant; the component material B comprises the following components in parts by weight: 97-99 parts of an ethylene-vinyl alcohol copolymer, 0.5-2 parts of a catalyst and 0.5-1 part of an antioxidant. The tensile strength and the elongation at break of the prepared internal shielding material are obviously improved, the change rate of the tensile strength and the elongation at break after aging is relatively small, the crosslinking degree is higher, the semi-conductive performance is excellent, the efficiency of a finished product is stable, and the internal shielding material has excellent heat resistance, weather resistance and flame retardance.

Description

technical field [0001] The invention relates to the technical field of overhead cables, in particular to an overhead silane self-crosslinking two-component inner shielding material and a preparation method thereof. Background technique [0002] Overhead cable is the abbreviation of overhead insulated cable. It is an overhead wire with an insulating layer and a protective outer layer. It is manufactured by a production process similar to that of cross-linked cables. It is a new power transmission method between overhead wires and underground cables. , overhead cables are single-core, according to their structural classification can be divided into hard aluminum wire structure, hard-drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core support structure and self-supporting three-core textured structure, etc. It has high power supply reliability, good power supply safety, convenient erection and maintenance, and reasonable economy. Its ma...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a kind of overhead silane self-crosslinking two-component inner shielding material and its preparation method, which solves the problem of existing overhead silane After aging, the self-crosslinking two-component inner shielding material has a large change rate of tensile strength and elongation at break, the degree of crosslinking is not high, the performance of the finished product is not good, the heat resistance, weather resistance and flame retardancy are poor, and the overall performance bad question

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